Parameters and Local Tags

With a
Logix 5000®
 controller, you use a tag (alphanumeric name) to address data (variables). In
Logix 5000®
 controllers, there is no fixed, numeric format. The tag name identifies the data and lets you do the following:
  • Organize your data to mirror your machinery.
  • Document your application as you develop it.
This example shows data tags that are created within the scope of the Main Program of the controller.
Parameters and Local Tags
This image shows how to access the main program parameters and local tags for a 5380 controller.

Program Parameters

Program parameters define a data interface for programs to facilitate data sharing. Data sharing between programs can be achieved either through pre-defined connections between parameters or directly through a special notation.
Unlike local tags, all program parameters are publicly accessible outside of the program. Additionally, HMI external access can be specified on an individual basis for each parameter.
There are several guidelines on how to create and configure parameters and local tags for optimal task and program execution:
  • Logix 5000 Controllers and I/O Tag Data Programming Manual, publication 1756-PM004
  • Logix 5000 Controllers Program Parameters Programming Manual, publication 1756-PM021
  • Logix 5000 Controllers Design Considerations Reference Manual, publication 1756-RM094
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